\documentclass[a4paper,12pt]{report}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[francais]{babel}
\usepackage[top=2cm, bottom=2cm, left=2cm, right=2cm]{geometry}
\usepackage{amsthm}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{mathrsfs}
\usepackage{setspace}

\onehalfspacing

\newcommand{\hypHH}{\underset{H0}{\overset{H1}{\gtrless}}}
\newcommand{\thetachap}{\overset{\wedge}{\theta}}

\begin{document}

\include{Traitement_Stat_Informations}

\end{document}